I took some notes while building it, but it’s a really tight fit and as it sits now it’s not functional (faulting, because it’s out of calibration).
Honestly it was kind of a pain and probably not worth the hassle in hindsight since it’ll still need tweaked a bit. We did a whole laundry list of mods & maintenance that day, 8 hours worth actually, so he needed to get going and further adjustments will have to wait.
Most stage 2 tunes do turn off the downstream o2, which is why we tested it before tuning the car.
Not all, but most. I believe APR (RIP) & UNI both offered tunes with it still enabled, but as you know UNI isn’t exactly up on their own tunes and often screws up which is which somehow (I’ve seen that be a issue for a bunch of people).
Anyway the real solution is flash back to the stock map before testing